Persistent identifier https://phaidra.univie.ac.at/o:1531660
Handle https://hdl.handle.net/11353/10.1531660
URI https://valep.vc.univie.ac.at/virtualarchive/public/Feigl_to_Philipp_Frank_Nagel_Carnap_Putnam_1955-10-28_L_Original/dv:853434